0, 4 USB two.0), two HDMI for external screens, and gigabit Ethernet. The dock is often laid flat about the desk or stood up vertically, and it conveniently has independent ports to get a microphone and headphones on the front. What is wonderful with regard to the UD-3900C is always https://socialupme.com/story160200/usb-hub-with-3-ports-and-ethernet-connector-for-dummies